For various reasons it can be difficult to run a Mechanical Turk experiment (i.e., you don't have the technical expertise, you don't reside in the United States, etc.)
Have any third-party providers ...

In human research, we define our universe and estimate the effect size we expect to observe, then we can draw the a sample of a given size.
How is sample size determined for experiments in the animal ...

My team and I are trying to use Inquisit for a reaction-time based experiment looking at attentional bias. However, with the no download policy on Mturk and CrowdFlower, we don't know a good site to ...